hot tempered

/ˈhɑt ˈtɛmpərd/
adjective
  1. Easily angered or quick to become angry.
    • My boss is hot-tempered and yells at the smallest mistake.
    • A hot-tempered driver honked at me for slowing down.
    • She's known for being hot-tempered, but she calms down quickly.
Antonyms